

char *strstr(char *src, char *dst)
{
    chart *pDst;
    while(src && *src) {
        pDst = dst;
        char *cur =src;
        while(*cur && *pDst && *cur == *pDst) {
           cur++;
           pDst++; 
        }
        if (*pDst == '\0') return src;
        src++;
    }
    return NULL;
}
